Gao Yuan, Guo Fengyun, Cao Peng, Liu Jingchong, Li Dianming, Wu Jing, Wang Nü, Su Yewang, Zhao Yong
Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bioinspired Energy Materials and Devices, School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P.R. China.
Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China.
ACS Nano. 2020 Mar 24;14(3):3442-3450. doi: 10.1021/acsnano.9b09533. Epub 2020 Mar 12.
Wearable and stretchable electronics including various conductors and sensors are featured with their lightweight, high flexibility, and easy integration into functional devices or textiles. However, most flexible electronic materials are still unsatisfactory due to their poor recoverability under large strain. Herein, we fabricated a carbon nanotubes (CNTs) and polyurethane (PU) nanofibers composite helical yarn with electrical conductivity, ultrastretchability, and high stretch sensitivity. The synergy of elastic PU molecules and spring-like microgeometry enable the helical yarn excellent stretchability, while CNTs are stably winding-locked into the yarn through a simple twisting strategy, making good conductivity. By virtue of the interlaced conductive network of CNTs in microlevel and the helical structure in macrolevel, the CNTs/PU helical yarn achieves good recoverability within 900% and maximum tensile elongation up to 1700%. With these features, it can be used as a superelastic and highly stable conductive wire. Moreover, it also can monitor the human motion as a rapid-response strain sensor by adjusting the content of the CNTs simply. This general and low-cost strategy is of great promise for ultrastretchable wearable electronics and multifunctional devices.
包括各种导体和传感器在内的可穿戴及可拉伸电子器件，具有重量轻、高柔韧性以及易于集成到功能设备或纺织品中的特点。然而，大多数柔性电子材料由于在大应变下恢复性差，仍不尽人意。在此，我们制备了一种具有导电性、超拉伸性和高拉伸灵敏度的碳纳米管（CNT）与聚氨酯（PU）纳米纤维复合螺旋纱线。弹性PU分子与弹簧状微观几何结构的协同作用，使螺旋纱线具有出色的拉伸性，而通过简单的捻合策略，碳纳米管能稳定地缠绕锁定在纱线中，从而具备良好的导电性。借助微观层面碳纳米管的交错导电网络和宏观层面的螺旋结构，碳纳米管/聚氨酯螺旋纱线在900%的应变范围内实现了良好的恢复性，最大拉伸伸长率高达1700%。凭借这些特性，它可用作超弹性且高度稳定的导线。此外，通过简单调整碳纳米管的含量，它还能作为快速响应应变传感器来监测人体运动。这种通用且低成本的策略对于超可拉伸可穿戴电子产品和多功能设备具有巨大的应用前景。
